CN110806428A - Special pH measuring device for generator inner cooling water system and working method thereof - Google Patents
Special pH measuring device for generator inner cooling water system and working method thereof Download PDFInfo
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Abstract
The invention discloses a special pH measuring device for a cold water system in a generator and a working method thereof, and the special pH measuring device comprises a flow meter, a conductivity flow cell, a hydrogen conductivity flow cell, a degassed hydrogen conductivity flow cell, a flow regulating valve, a multi-channel conductivity meter, a PLC control panel, a color-changing cation exchange column, a carbon dioxide remover and an electrically regenerated cation exchanger, wherein the flow regulating valve and the flow meter are arranged on a sampling pipeline led out by a water outlet pipeline of a cold water cooler in the generator, and the flow regulating valve, the flow meter, the conductivity flow cell, the electrically regenerated cation exchanger, the color-changing cation exchange column, the hydrogen conductivity flow cell, the carbon dioxide remover and the degassed hydrogen conductivity flow cell are sequentially connected according to the water flow direction; the conductivity flow cell, the hydrogen conductivity flow cell and the degassed hydrogen conductivity flow cell are respectively connected with a multi-channel conductivity meter, and the multi-channel conductivity meter is connected with the PLC control panel. The invention has wide application range, and can be used for a fixed cooling water system and a double water internal cooling system.
Description
Technical Field
The invention relates to the technical field of water quality monitoring of power plants, in particular to a device for measuring the pH value of cold water in a generator.
Background
The generator inner cooling water system plays a vital role in the safe operation of the generator, and the inner cooling water plays a role in cooling and insulating in the stator bar at the same time, so that the generator can be effectively prevented from generating accidents caused by overheating or short circuit. During the operation of the large-scale turbonator, the conductivity and the pH value of cooling water are continuously measured on line, and the copper content, the inner cooling water flow, the ammonia content and the hardness are measured periodically. According to the existing chemical detection means, the on-line monitoring of the conductivity of the inner cooling water can be well realized, and the copper content, the ammonia content and the hardness can be sampled and analyzed. However, when the internal cooling water (pure water) is used for offline detection of the pH value, the influence factors caused by external interference are too large, so that the pH value is required to be monitored online.
At present, the pH value of cold water in a generator is monitored on line mainly by a direct electrode method, but the cold water in the generator belongs to pure water, and electrostatic charge, liquid-electricity connection potential and temperature can cause great influence on measurement. In addition, most of the existing pH meters are directly installed in a pipeline with pressure, so that the reference solution of the pH electrode cannot normally permeate, and the measurement accuracy is seriously influenced; if the measured water sample is not recycled, the water supplement amount is larger. Due to the factors, the pH value measurement accuracy of the cold water in the generator is poor, and the influence can only be reduced but not completely eliminated by adopting corresponding measures, so that the pH value of the cold water is difficult to accurately measure by using a pH value measuring instrument used in a power plant.
The normal operation of the internal cooling water system of the generator is seriously influenced by the poor pH measurement accuracy of the internal cooling water, and the conditions that the conductivity and the copper content are qualified but the pH is low often occur. In order to ensure that the grounding resistance meets the requirement, the pH value can not be adjusted on site by improving the conductivity, and finally the quality of the internal cooling water can not meet the standard requirement. Fundamentally, the reason is that the pH value of the internal cooling water is small, the actual water quality cannot be reflected, and the normal judgment of operators is misled. In order to solve the problem of interference with field operation, the problem of accurate measurement of the pH of the quasi-internal cooling water is urgently needed to be solved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the special pH measuring device for the cold water system in the generator, which can realize online pH monitoring, is not influenced by static charge, liquid junction potential, temperature and the like in measurement and can ensure the measurement accuracy.
The technical scheme adopted by the invention for solving the problems is as follows: a special pH measuring device for a cold water system in a generator is characterized by comprising a flow meter, a conductivity flow cell, a hydrogen conductivity flow cell, a degassed hydrogen conductivity flow cell, a flow regulating valve, a multi-channel conductivity meter, a PLC control panel, a color-changing cation exchange column, a carbon dioxide remover and an electric regeneration cation exchanger, wherein the flow regulating valve and the flow meter are installed on a sampling pipeline led out from a water outlet pipeline of a cold water cooler in the generator, the flow regulating valve, the flow meter, the conductivity flow cell, the electric regeneration cation exchanger, the color-changing cation exchange column, the hydrogen conductivity flow cell, the carbon dioxide remover and the degassed hydrogen conductivity flow cell are sequentially connected according to the water flow direction, and the degassed hydrogen conductivity flow cell is connected to an inner cold water tank; the conductivity flow cell, the hydrogen conductivity flow cell and the degassed hydrogen conductivity flow cell are respectively internally provided with a conductivity electrode, a hydrogen conductivity electrode and a degassed hydrogen conductivity electrode, and are respectively connected with a multi-channel conductivity meter through a conductivity electrode wire, a hydrogen conductivity electrode wire and a degassed hydrogen conductivity electrode wire, and the multi-channel conductivity meter is connected with a PLC control panel.
Furthermore, a water outlet pipeline of the cold water cooler in the generator is connected with the sampling pipeline through a three-way valve.
Furthermore, the carbon dioxide remover is connected with an electric heating controller, and the top and the bottom of the carbon dioxide remover are respectively provided with a cooling water inlet and a cooling water outlet.
The working method of the special pH measuring device for the cold water system in the generator is characterized by comprising the following steps of: and a water sample flows through the flow regulating valve and then flows through the conductivity flow cell, the hydrogen conductivity flow cell and the degassed hydrogen conductivity flow cell in sequence, the multi-channel conductivity meter is used for measuring the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity of the internal cooling water, the measurement result is input into the PLC control panel through 4-20 mA, and the pH measurement value is displayed after the measurement result is processed by the PLC control panel.
Furthermore, the invention continuously monitors the concentration of the impurity anions in the cold water by measuring the hydrogen conductivity and the degassed hydrogen conductivity of the cold water, thereby eliminating the influence of the impurity anions on the calculation of pH.
Furthermore, the pH of the internal cooling water is calculated only by 3 variables of the electrical conductivity, the hydrogen electrical conductivity and the degassed hydrogen electrical conductivity, and the 3 variables can be accurately measured, so that the accuracy of the pH calculation is ensured.
Furthermore, the method realizes the accurate calculation of the pH value of the internal cooling water, avoids various problems existing in the process of directly measuring the pH value of the internal cooling water by using a pH meter, and greatly improves the accuracy and the reliability of the measurement of the pH value of the internal cooling water.
Furthermore, the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity of the invention are measured by using a multi-channel conductivity meter, and the electrode constant is required to be 0.01cm-1Or 0.04cm-1And the stage requires pure water, acidity, ammonia and other temperature compensation modes, and ensures that the selected instrument is suitable for the measurement requirement of special quality of the internal cooling water.
Furthermore, in order to accurately determine the hydrogen conductivity of the internal cooling water, the invention adopts a mode of connecting the electrically regenerated cation exchange column and the color-changing cation exchange column in series, and can simultaneously ensure the measurement accuracy and the operation period.
Furthermore, in order to ensure that the hydrogen conductivity of the inner cooling water needs to be measured continuously, the electrically regenerated cation exchange column is arranged in front of the color-changing cation exchange column, most of cations in the water are removed by the electrically regenerated cation exchange column, and the color-changing cation exchange column only plays a role in improving the accuracy and standby, so that the hydrogen conductivity can be measured continuously for a long time.
Compared with the prior art, the invention has the following advantages and effects:
the pH measurement result has high accuracy. When the internal cooling water adopts a certain treatment process, the specific composition of the internal cooling water is determined by the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity, and the corresponding pH value is unique. The pH value of the internal cooling water can be calculated by measuring the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity of the internal cooling water, and the requirements on the accuracy and the reliability of the calculated pH value are far higher than those of a direct electrode method.
Can be operated for a long time and is free from maintenance. When the pH value of the internal cooling water is measured by a direct method, the inspection and calibration work needs to be carried out regularly, and the electrodes need to be replaced for half a year or one year. The pH measuring device does not need to be calibrated and maintained after being installed and debugged, and does not need to replace electrodes. Because the preposed electric regeneration cation exchange column is installed, the service cycle of the color-changing cation exchange column can reach at least one year.
No pollution discharge, and small water replenishing amount in the inner cooling water system. Because the invention only monitors the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity during operation, and the sampled and measured water sample can directly return to the internal cold water tank, the whole internal cold water system basically has no water loss and basically does not need to supplement water.
The application range is wide, and the device can be used for a fixed cooling water system and a double water internal cooling system.
Drawings
Fig. 1 is an installation layout diagram of the pH measuring device specifically for use in a cold water system in a generator according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a pH measuring device dedicated to a cold water system in a generator according to an embodiment of the present invention.
In the figure: the device comprises a three-way valve 1, a flowmeter 2, a conductivity flow cell 3, a hydrogen conductivity flow cell 4, a degassed hydrogen conductivity flow cell 5, a flow regulating valve 6, a multi-channel conductivity meter 7, a PLC control panel 8, a conductivity electrode 9, a hydrogen conductivity electrode 10, a degassed hydrogen conductivity electrode 11, a color-changing cation exchange column 12, a carbon dioxide remover 13, an electrically regenerated cation exchanger 14, a conductivity electrode wire 15, a hydrogen conductivity electrode wire 16, a degassed hydrogen conductivity electrode wire 17 and an electric heating controller 18.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Example 1.
Referring to fig. 2, the pH measuring apparatus dedicated for the cold water system in the generator in the present embodiment includes a flow meter 2, a conductivity flow cell 3, a hydrogen conductivity flow cell 4, a degassed hydrogen conductivity flow cell 5, a flow regulating valve 6, a multichannel conductivity meter 7, a PLC control panel 8, a color-changing cation exchange column 12, a carbon dioxide remover 13, and an electrically regenerated cation exchanger 14, wherein the flow regulating valve 6 and the flow meter 2 are installed on a sampling pipeline led out from an outlet pipeline of the cold water cooler in the generator, and the flow regulating valve 6 and the flow meter 2, the conductivity flow cell 3, the electrically regenerated cation exchanger 14, the color-changing cation exchange column 12, the hydrogen conductivity flow cell 4, the carbon dioxide remover 13, and the degassed hydrogen conductivity flow cell 5 are sequentially connected in a water flow direction, and the degassed hydrogen conductivity flow cell 5 is connected to an internal cold water tank; the conductivity flow cell 3, the hydrogen conductivity flow cell 4 and the degassed hydrogen conductivity flow cell 5 are respectively provided with a conductivity electrode 9, a hydrogen conductivity electrode 10 and a degassed hydrogen conductivity electrode 11, the conductivity flow cell 3, the hydrogen conductivity flow cell 4 and the degassed hydrogen conductivity flow cell 5 are respectively connected with the multi-channel conductivity meter 7 through a conductivity electrode wire 15, a hydrogen conductivity electrode wire 16 and a degassed hydrogen conductivity electrode wire 17, and the multi-channel conductivity meter 7 is connected with the PLC control panel 8.
In this embodiment, the water outlet pipeline of the cold water cooler in the generator is connected to the sampling pipeline through the three-way valve 1.
In this embodiment, the carbon dioxide remover 13 is connected to an electric heating controller 18, and the top and the bottom of the carbon dioxide remover 13 are respectively provided with a cooling water inlet and a cooling water outlet.
The working method of the special pH measuring device for the generator inner cooling water system is characterized by comprising the following steps: a water sample flows through the flow regulating valve 6 and then flows through the conductivity flow cell 3, the hydrogen conductivity flow cell 4 and the degassed hydrogen conductivity flow cell 5 in sequence, the multichannel conductivity meter 7 measures the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity of the internal cooling water, the measured result is input into the PLC control panel 8 through 4-20 mA, and the pH measured value is displayed after being processed by the PLC control panel 8.
The multi-channel conductivity meter 7 has at least 3 conductivity channels and has temperature compensation function, and the electrode constant of the power distribution conductor is required to be 0.01cm-1Grade or 0.04cm-1And (4) stages.
When measuring the hydrogen conductivity, the electrically regenerated cation exchange column 14 and the color-changing cation exchange column 12 are connected in series to play a role in removing cations. The color-changing cation exchange column 12 is made of transparent organic glass, and when the resin in the color-changing cation exchange column 12 fails 3/4, the resin is replaced.
And the conductivity, the hydrogen conductivity and the degassing hydrogen conductivity measured by the multi-channel conductivity meter 7 are transmitted to the PLC control panel 8 by a standard signal of 4-20 mA, and the PLC control panel 8 performs data processing to finally obtain the pH value of the cold water in the generator.
Example 2.
Referring to fig. 1, the pH measuring device dedicated for the generator internal cooling water system is installed at the outlet of the cooler of the generator internal cooling water system to ensure that the temperature of the water sample is not too high. The pH measuring device is connected with an inner cooling water sampling pipeline in series through a three-way valve 1, and the measured water sample returns to an inlet of the exchanger or directly returns to the inner cooling water tank. When taking a sample, the water sample flow of the measuring pipeline can be reduced for a short time, and the influence on the measurement can be ignored.
Referring to fig. 2, the pH measuring device special for the generator internal cooling water system is composed of a three-way valve 1, a flowmeter 2, a conductivity flow cell 3, a hydrogen conductivity flow cell 4, a degassed hydrogen conductivity flow cell 5, a flow regulating valve 6, a multi-channel conductivity meter 7, a PLC control panel 8, a color-changing cation exchange column 12, a carbon dioxide remover 13, an electrically regenerated cation exchanger 14 and an electrical heating controller 18.
The three-way valve 1, the flow regulating valve 6, the flow meter 2, the conductivity flow cell 3, the electrically regenerated cation exchanger 14, the color-changing cation exchange column 12, the hydrogen conductivity flow cell 4, the carbon dioxide remover 13 and the degassed hydrogen conductivity flow cell 5 are connected in series, and a measured water sample sequentially passes through the device. The electric conductivity electrode wire 15, the hydrogen electric conductivity electrode wire 16 and the degassed hydrogen electric conductivity electrode wire 17 are in parallel relation, one end of the three is respectively connected with the electric conductivity flow cell 3, the hydrogen electric conductivity flow cell 4 and the degassed hydrogen electric conductivity flow cell 5, the other end is simultaneously connected with the multi-channel electric conductivity meter 7, and real-time measured values are displayed on different channels of the multi-channel electric conductivity meter 7.
In order to reduce the temperature of the high-temperature water sample after the carbon dioxide removal to an acceptable value of the multichannel conductivity meter 7, one path of water is separately introduced as high-temperature water sample cooling water, a cooling water inlet and a cooling water outlet are respectively arranged at the top and the bottom of the carbon dioxide remover 13, and the cooling water sample can be closed water or industrial water. The cooling water can be directly discharged into a unit drainage tank after heat exchange, and can also be recycled to a closed water system or an industrial water system.
The pH of the cold water is calculated by a dedicated pH calculation model, which is theoretically derived as follows: when the inner cooling water adopts NaOH as an alkalizer, the inner cooling water is mixed with CO2The following equilibrium exists in the internal cooling water:
[H+]+[Na+]＝[OH-]+2[CO3 2-]+[HCO3 -](1)
CO when cold water is present2When the content (CC) and pH are known, [ CO ] is known3 2-]、[HCO3 -]And [ CO ]2]The following relationships exist:
[CO2]＝[CO3 2-]+[HCO3 -]+[H2CO3](4)
finishing to obtain:
will [ CO ]3 2-]、[HCO3 -]And [ H+]Can be substituted into formula (1) to obtain [ Na+]：
This gives the internal cooling water conductivity SC:
theoretical calculations show that: CO when cold water is present2The content (CC), pH and SC have a one-to-one correspondence. On the basis that the CC, SC and pH of the internal cooling water have one-to-one correspondence, a large number of tests are combined to establish a special pH calculation model for the internal cooling water of the generator, and the model contains 3 characteristic input variables which are respectively the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity.
Compared with the method of directly measuring the pH value by adopting an electrode method, the method has the advantages that the measurement accuracy of the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity is high, and the accuracy of the input variable can be ensured. The calculation model of the pH value of the internal cooling water is derived through theoretical calculation and verified through experiments, and the accuracy of the calculation model can be ensured, so that the accuracy of the pH value measurement of the internal cooling water can be ensured.
The PLC control panel 8 can receive a 4-20 mA current signal, a built-in program of the PLC control panel 8 can output the pH value of cold water in the generator according to the special pH calculation model, and meanwhile, the panel can be connected to a power plant DCS control system and displays an actual measurement value in an industrial computer of a centralized control room.
The conductivity, the hydrogen conductivity and the degassing hydrogen conductivity measured by the multi-channel conductivity meter 7 are transmitted to the PLC control panel 8 through 4-20 mA standard signals, and the PLC control panel 8 performs data processing through a built-in pH calculation model to finally obtain the pH value of the cold water in the generator.
The flow rate is preferably controlled by a flow rate control valve 6, and a suitable flow rate range is 150mL to 250 mL. The flow meter 2 can be used for flow control if the flow regulating valve 6 fails.
The inside of the electric regeneration cation exchanger 14 is provided with an automatic exhaust valve to prevent air from entering the electric regeneration chamber to cause measurement error or cannot be regenerated.
The color-changing cation exchange column 12 adopts a forward flow mode of top-in-bottom-out, and the top of the column is provided with an exhaust valve which can exhaust air possibly accumulated on the top of the column 12. When the color-changing resin reaches 3/4 of the total resin amount, the regenerated hydrogen-type resin is refilled.
The water sample enters a carbon dioxide remover 13 after flowing through the hydrogen conductivity flow cell 4, the carbon dioxide remover 13 removes carbon dioxide by adopting a thermal degassing mode, the heating mode is electric heating, and the electric heating controller 18 is used for temperature control, so that the water sample is ensured to be in a boiling state but not overheated.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (4)
1. A special pH measuring device for a cold water system in a generator is characterized by comprising a flow meter (2), a conductivity flow cell (3), a hydrogen conductivity flow cell (4), a degassed hydrogen conductivity flow cell (5), a flow regulating valve (6), a multi-channel conductivity meter (7), a PLC control panel (8), a color-changing cation exchange column (12), a carbon dioxide remover (13) and an electrically regenerated cation exchanger (14), wherein the flow regulating valve (6) and the flow meter (2) are installed on a sampling pipeline led out from a water outlet pipeline of the cold water cooler in the generator, the flow regulating valve (6), the flow meter (2), the conductivity flow cell (3), the electrically regenerated cation exchanger (14), the color-changing cation exchange column (12), the hydrogen conductivity flow cell (4), the carbon dioxide remover (13) and the degassed hydrogen conductivity flow cell (5) are sequentially connected according to the water flow direction, and the degassed hydrogen conductivity flow cell (5) is connected to an internal cold water tank; the conductivity flow cell (3), the hydrogen conductivity flow cell (4) and the degassed hydrogen conductivity flow cell (5) are respectively provided with a conductivity electrode (9), a hydrogen conductivity electrode (10) and a degassed hydrogen conductivity electrode (11), the conductivity flow cell (3), the hydrogen conductivity flow cell (4) and the degassed hydrogen conductivity flow cell (5) are respectively connected with a multi-channel conductivity meter (7) through a conductivity electrode wire (15), a hydrogen conductivity electrode wire (16) and a degassed hydrogen conductivity electrode wire (17), and the multi-channel conductivity meter (7) is connected with a PLC control panel (8).
2. The pH measuring device special for the cold water system in the power generator as claimed in claim 1, wherein the water outlet pipeline of the cold water cooler in the power generator is connected with the sampling pipeline through a three-way valve (1).
3. The pH measuring device special for the cold water system in the generator as claimed in claim 1, wherein the carbon dioxide remover (13) is connected with an electric heating controller (18), and the top and the bottom of the carbon dioxide remover (13) are respectively provided with a cooling water inlet and a cooling water outlet.
4. A method for operating the pH measuring device of any one of claims 1 to 3, wherein the method comprises the following steps: a water sample flows through the flow regulating valve (6) and then flows through the conductivity flow cell (3), the hydrogen conductivity flow cell (4) and the degassed hydrogen conductivity flow cell (5), the multichannel conductivity meter (7) measures the conductivity, the hydrogen conductivity and the degassed hydrogen conductivity of the internal cooling water, the measured results are input into the PLC control panel (8) through 4-20 mA, and the pH measured value is displayed after being processed by the PLC control panel (8).
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| CN111735855A (en) * | 2020-07-31 | 2020-10-02 | 华能国际电力股份有限公司日照电厂 | Method, system, device and readable medium for acquiring pH value of cold water in generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111735855A (en) * | 2020-07-31 | 2020-10-02 | 华能国际电力股份有限公司日照电厂 | Method, system, device and readable medium for acquiring pH value of cold water in generator |
| CN111982980A (en) * | 2020-08-04 | 2020-11-24 | 北京边华电化学分析仪器有限公司 | Boiler pipeline leakage detection device |
| CN112225291A (en) * | 2020-08-11 | 2021-01-15 | 华电电力科学研究院有限公司 | Generator inner cooling water treatment device based on separated bed EDI and control method |
| CN114428105A (en) * | 2021-12-16 | 2022-05-03 | 华能南京燃机发电有限公司 | Device and method for detecting multiple indexes of water vapor of gas turbine power station |
| CN114791450A (en) * | 2022-03-04 | 2022-07-26 | 华电电力科学研究院有限公司 | Desulfurization slurry on-line pH meter measuring device and method |
| CN115343536A (en) * | 2022-08-23 | 2022-11-15 | 浙江西热利华智能传感技术有限公司 | Power station water vapor multi-parameter cooperative measurement system and method |
| CN115541676A (en) * | 2022-10-17 | 2022-12-30 | 吉林省电力科学研究院有限公司 | Water sample constant temperature device for detecting pH and conductivity of cold water in power plant |
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